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I got a medium warning: The substrate thickness factor for port1 is too big (0.087182 vs. 0.085) The Ground Seperation/length ratio for Port 1 is too big(1.45303 vs. 0.5). Can I ignore the warning? I am using the new version. I remember somewhere Jian mentioned that the new version will extend the port length (...)
Hi Does the width/height ratio of a die have to be close to 1:1 ? is it a bad idea to make a rectangular die with large width/height ratio?
try to make the width-length ratio of M9 and m10 different. two tips to form a hysteresis: the first is positive feedback. the second is that the circuits for two cases(vp>vn and vp
for a buffer without negative feedback, the minimum output resistance is about the reciprocal of the transcondance, so if you need to get a smaller output resistance, all you need to do is to increase the transcondance(Eg:increase the current and the width-length ratio,sometimes using nmos rather pmos due to mobility). it's theoretically (...)
I'm simulating a patch atenna. It simple to use the optimizer for finding the feeding point for a perfect match at the resonance frequency. But is there a way of also optimizing the antenna for maximum bandwidth? If the antenna height and dielectric is chosen, then the bandwidth is proportional to the width/length (...)
In a typical inverter, NMOS pulls the output to low, while PMOS pulls the output to high. To increase the threshold, you need to increase the strength of the NMOS and/or reduce the strength of PMOS. The strengh of a MOSFET is decided by its W/L (width/length) ratio. The bigger this radio is, the stronger this MOSFET is. So now you know what to do.
How to calculate (W/L) of pull up and pull down networks.Please help me with detailed description or provide me with some material. Thanks.
width and the height of the waveport definitely affect the impedance. If I remember right, the ground rules are 1. width of the waveport should be 5 times the g/s/g and 2. height should be 4 times the substrate's height. Of course, the integration line can be drawn either from the signal to ground line or the other way. I also found (...)
hi.. how to calculate width for power ring ? thanks..
Hi guys, Im trying to design edge coupled filter on ADS momentum. i having trouble calculating the width and spacing of the filter although i manage to calculate the odd and even impedance. i also wanted to knw which parameter will change the resonant freq of the coupled filter is it the width, length or spacing? thanks guy
Check the process specification - it will be in there. It won't be a percentage - it will be an absolute value. It will be different for width & length. Keith
You need 100 ohm resistance in the TFR. If the sheet resistance is 100 Ohm/square, make TFR length = width.
Where to define the V-I characteristics of a new created device\part. e.g., I have to use MOS and I created my own part using ?NEW PART? in ?USER DEFINED PROPERTIES? i added new property width, length but where I have to give the characteristic equation which defines the relation of voltage, current, W/L ratio and other parameters.
Hi guy's, I want to know how can I find the Min/Max gate width/length for specific technology ( 0.18um for example). Are they deteremined in the tech. parameters sheet??,, because I am using TSMC0.18um in my design and I have very big transistors ( 40.5um/40.5um) is that acceptable for layout?? Thanks
In custom digital design , how can I determine the values of(width,length) of transistor , for example for comparator or flip-flop?
Has anyone ever seen a filter program called GBCL, i downloaded it a few years ago. It calculates the width, length and gaps for edge filters. This software is based on a book by matai, jones and young. Now, you can manually work through the book to get the same results but the problem lies when you have to use a nonograph to get the w/h parame
Hi, I have a simple transistor level schematic in Cohesion. Can somebody tell me how can I make visible not only the value of an attribute, but also its name. For example now as width/length values I have “5u/1u”, but what I want is: “W=5u/L=1u”. Thanks.
If I add microstrips in schem then optim it, maybe it's not fit for layout; What do you mean by 'may not fit for layout'? Do you have size constrains (like your circuits must not exceed certain size)? or maybe microstrip manufacturing constrains (like minimum width or spacing of your lines)? If you have any of the abov
there are some standard formulae that provide width & length of a microstrip depending on the type of substrate used, the thickness of the copper cladding. These are for higher frequencies. To answer your question, the width of your track will depend on how much dc current is going to flow through.. go to rogers website and they've got a (...)
Hi, friends: We can export the CDL netlist from Cadance, like: M*** d g s b PV W=10u L=2u M=1 R*** net1 net2 NumberOfsheet $ But CDL netlist can't be simulated directly using Hspice, we must find and replace. Does there exit method to export the Hspice netlist that can be recognzied directly by Hspice simulator with
Visit the Ansoft's web page: Download the materials related with HFSS 9. One among them: In this tutorial see the "Tutorial 3" which describes how to build a microstrip antenna with stripline and with a
LDO give same quantity as request , until maximum allowed for him. It's work as constant voltage source, not constant current. You must care about only three things : LDO output voltage equal VCC of controller LDO maximum current greater then maximum required for controller LDO dissipated power : when you are using LDO be sure, that the
I think that somehow desing process of analog ckts is similar to that of software. The schematic is sortof seen as the code. Below I take an example of design w/ Cadence. If I design a big ckt, first I divide the whole one into a few seperate blocks. Second, I begin to work on each individual block, I use design parameter to take place of t
I browsed almost all the papers of the IEEE of the gain boosted OTA, all mostly said about the same thing, just add a Op Amp to increase Rout, like the picture attached.... The problem is how to decide the bias and the width/length of the the added Op Amp. I used the Op Amp as same as the original one(the one needed gain boost), the
all, I can create symbols of my schematics no problem in cadence, but how do I create a symbol so when I query it I can change the parameters (i.e. width, length etc). I want to make my own set of library cells, inv, and, etc. Any help is greatly appreciated. Texan1
This is what you do: you approximate the actual power pulse with a rectangular pulse having the same amplitude as your actual pulse and a width (length) such that the area is equal to that of the original pulse. For your exponential pulse, the equivalent rectangular power pulse will have the peak equal to Uc^2/R and the duration equal to (...)
hi, at first, sorry about my poor English. I got a problem with CADENCE "export netlist" I have defined CDF parameters of width, length, Drain diffusion area, Source diffusion area in schematic. But only width and length can be seen in netlist. How to make every defined parameters be showed in netlist. thanks.
Can anyone please refer a clear document regarding trace impedance in routing, and how to keep trace length and width according to impedance, how to calculate etc.. I am a beginner and i need a good document which help me to learn the trace width length etc which helps in routing
To define a point source, choose to select spatial excitation type "current" in the launch parameters, and set the width, length,height to be zero as well. When it is 2d the orientation is fixed along the y direction while for the 3d you can adjust it. Yes there is difference between the TE and TM .
Sorry, maybe I should put it this way, I need a set of guiding formulas for computing the geometry (width, length, gap,..) for the meander line. Thanks.
I have given area of a rectangle and I have to select the length and width of the rectangle in such a way that the perimeter of the rectangle comes out to be maximum. Area = 4.3475
i get some warningswhen run frequency domain solve: 1)The length ratio between the shortest and the longest model is 1:800.This is often caused by modelling thin metal layers by using solids.if this is the case here,it may be adventageous to model the metallizations as infinştely thin sheets. 2)could not enlarge the distance to the
Hi, Does anyone know how does a change in the following parameters: 1. cutoff frequency electrical filter in a receiver 2. responsivity of a avalanche photodiode 3. gain multiplication factor of a avalanche photodiode 4. pulse length ratio of a RZ Coder 5. rise time affects the eye diagram? And why? Thanks.
Yes, i have tried with different mesh size, and there are small differents, but not enough to match the measurement with the simulation results. I think that it can be a problem with the excitation. I'm using a wire port with a voltage source, and i have seen that results are very sensible to the radius of the wire. The problem is that if I use
Hi, For a rectangular DRA, you have to look for this paper: Theoretical and experimental investigations on rectangular dielectric resonator antennas Kumar Mongia, R.; Ittipiboon, A.; First, choose the permittivity of your DRA, know which mode you want to excite, choose the height or length and solve the transcendental equation for the width.
Hi all, I wonder if anybody know a software that can determine the parasitics on a PCB. That is, after drawing/routing a PCB, I want to find the capacitance of some sensitive traces to GND plan (or resistance between two points on a trace). Thanx in advance
Hi jian I think he look for some menu for drawing polyline but with width. we need menu that we can choose the width length of line and angel. and then after each entry we will see the line. like waking in maze. BST RGZ plasma
in ADS MOMENTUM! how size(of sabstrate:width,length) is determined in practical applications? thank you for your attention!
hii guys, i have designed a meander line antenna but i dont know how they calculated the width ,length and no of turns...... i want to know whether there are any standard design equations for calculating the width ,length and no of turns... check out the papers which i uploaded
hi what is "Tau" ? few times I heard some people use tau instead of milimeter or micrometer or mil for trace width or dielectric thickness specification.
Hi everybody I already design a planar antenna in cst(monopole) but I don't know how to feed the antenna with a coax cable because the ground is in the same plane as the antenna i used a discrete port but I don't know if I am correct because I had to change the impedance (10 ohms) to have the same result (simulate and measured) also can I us
I am trying to simulate RF power amplifier schematics to check for the influence of gate oxide thickness and/or channel width/length on the power output, or actually any output parameter.It's very funny. AT41435 is as Bipolar Transistor. So any of gate oxide thickness and/or channel width/length don't exist. Can you un
if the circuit R netlist has value and width , length at the same time , the hspice will default adopt width , length for simulation , instead of R value. how to alter the simulation option to let it sim by R's value instead of w,l ? if the R'value , w, l , display at the same time?
i want to design a hybrid ring, i dont know about the radius of the inner circle of HYBRID RING some on said find the guided wave length value λg=guided wavelength for my design a=1.086cm;b=2.286cm; Parameters for TEmn or TMmn m=1, n=0 * Mode Cutoff Frequency: 6.55714037620297 GHz * Free-space wavelength
You can use ....Agilent,s ADS Software ... i f u want change the width while maintaining constant 50 impedence, u should use Taper line. In ads u can easily draw it. Added after 3 minutes: can u give me stack up of ur PCB Board, So that i can help u... Added after 9 minutes:
hi all! can anyone help me to design a 2.45 GHz three-way power combiner on a FR4 board with substrate permitivity of 4.7 and thickness 1.6 mm, loss tangent 0.0025, copper height is 0.04 mm. impedance is 50-ohm. I only have Ansoft and CST for simulations. i'm kinda new to this but i've already done some research and found out that's its very
More width may mean individual outputs travel more toward the rail, hence longer period than a mode where things are small signal. Look at the nature of the intermediate nodes and see whether the mode of oscillation is really what you want.
u plz give me a clear diagram with all the width , length and bias values since i m trying to build the same diff ring oscillator in mentor graphics daic tool and matlab/simulink. then i will chk and try to build your ckt even i face the same problem it shows square wave only when i put inverters at the + and - output otherwise it dont shows an
Hi ,all since i want to transfer our design(schematic) from one fountry to another(both are 0.13um process,but obvious different pdk and models). if done by hand , it's a big job. someone told me use lib manager-->rename reference library. it works , but many parameters transfer worng(eg. width,length,fingers). so it seems need script
Good day everyone, if i have to match 2 transistors of a current mirror with W/L 9.6um/1um and 7.2um/1um .Now if i fold these transistors for interdigitation then do i need that all interdigitated transistors have equal widths or just symmetry is required. i.e ABBA | ABBA is required. but can A have width of 1.8um and B have width of (...)